LTC3115-1
ELECTRICAL CHARACTERISTICS
PARAMETER
Input Operating Voltage
Output Operating Voltage
Input Undervoltage Lockout Threshold
Input Undervoltage Lockout Hysteresis
V
CC
Undervoltage Lockout Threshold
V
CC
Undervoltage Lockout Hysteresis
Input Current in Shutdown
Input Quiescent Current in Burst Mode Operation
Oscillator Frequency
Oscillator Operating Frequency
PWM/SYNC Clock Input Frequency
PWM/SYNC Input Logic Threshold
Soft-Start Duration
Feedback Voltage
Feedback Voltage Line Regulation
Feedback Pin Input Current
RUN Pin Input Logic Threshold
RUN Pin Comparator Threshold
RUN Pin Hysteresis Current
RUN Pin Hysteresis Voltage
Inductor Current Limit
Reverse Inductor Current Limit
Burst Mode Inductor Current Limit
Maximum Duty Cycle
Minimum Duty Cycle
SW1, SW2 Minimum Low Time
N-Channel Switch Resistance
The
l
denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are for T
A
= 25°C (Note 2). V
IN
= 24V, V
OUT
= 5V, unless otherwise noted.
CONDITIONS
l
l
MIN
2.7
2.7
TYP
V
IN
Falling
V
IN
Rising
V
IN
Rising (0°C to 125°C)
V
CC
Falling
V
RUN
= 0V
V
FB
= 1.1V (Not Switching)
R
T
= 35.7k
l
l
2.4
2.6
100
2.4
200
3
50
1000
MAX
40
40
2.7
2.8
2.725
2.6
10
1100
2000
2000
1.5
1017
50
1.1
1.26
l
l
l
l
l
l
900
100
100
0.5
977
V
IN
= 2.7V to 40V
l
V
RUN
Rising
l
0.3
1.16
N-Channel Switch Leakage
PV
CC
/V
CC
External Forcing Voltage
V
CC
Regulation Voltage
V
CC
Load Regulation
V
CC
Line Regulation
V
CC
Current Limit
V
CC
Dropout Voltage
V
CC
Reverse Current
(Note 3)
Current into PV
OUT
(Note 3)
(Note 3)
Percentage of Period SW2 is Low in Boost Mode,
R
T
= 35.7k (Note 5)
Percentage of Period SW1 is High in Buck Mode,
R
T
= 35.7k (Note 5)
R
T
= 35.7k (Note 5)
Switch A (From PV
IN
to SW1)
Switch B (From SW1 to PGND)
Switch C (From SW2 to PGND)
Switch D (From PV
OUT
to SW2)
PV
IN
= PV
OUT
= 40V
I
VCC
= 1mA
I
VCC
= 1mA to 20mA
I
VCC
= 1mA, V
IN
= 5V to 40V
V
CC
= 2.5V
I
VCC
= 5mA, V
IN
= 2.7V
V
CC
= 5V, V
IN
= 3.6V
l
2.4
0.65
90
l
l
1.0
9
1000
0.1
1
0.8
1.21
500
100
3.0
1.5
1.0
95
3.7
1.35
UNITS
V
V
V
V
V
mV
V
mV
µA
µA
kHz
kHz
kHz
V
ms
mV
%
nA
V
V
nA
mV
A
A
A
%
%
ns
mΩ
mΩ
mΩ
mΩ
µA
V
V
%
%
mA
mV
µA
0
100
150
150
150
150
0.1
4.58
4.33
4.45
1.2
0.5
110
50
10
10
5.5
4.58
50
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
The LTC3115-1 is tested under pulsed load conditions such that
T
J
≈ T
A
. The LTC3115E-1 is guaranteed to meet specifications from 0°C to
85°C junction temperature. Specifications over the –40°C to 125°C operating
junction temperature range are ensured by design, characterization and
correlation with statistical process controls. The LTC3115I-1 specifications
are guaranteed over the –40°C to 125°C operating junction temperature
range. The maximum ambient temperature is determined by specific
operating conditions in conjunction with board layout, the rated package
thermal resistance and other environmental factors.
31151f
3
LINEAR [ LINEAR INTEGRATED SYSTEMS ]
